Tenfourbird is unofficial build of Mozilla Thunderbird for PowerPC based Mac OS X.
Tenfourbird uses changesets of TenFourFox.
Latest version is 38.9.0.
This is Enigmail add-on for Thunderbird PPC Mac. Enigmail can sign and encrypt email by OpenPGP (gnupg).
You can check integrity of files by SHA1 hashes. It also signed by OpenPGP key of t_mrc-ct[at]users.sourceforge.jp. The public key could get from here or OpenPGP Keysever.
This build based on enigmail-1-5-0